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U.S. Patent 7,418,8000
8.3.
Opening Angle: The doughnut magnet on the underside of the clutch arm activates the sensor velcroed to the
motor. The motor is turned off when the magnet passes the sensor. The doughnut magnet and velcroed
sensor should be positioned so that the motor shuts off when the door is 75-80 degrees open and the door
will coast to a soft stop at about 90 degrees.
A DOOR STOP MUST BE USED TO PREVENT THE DOOR FROM TRAVELING BEYOND 90
DEGREES.